darkly 0.5.0

A GPU-native paint engine on wgpu: brushes, layers, blend modes, masks, selections, and undo.
Documentation 
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//! Painting requests — background fills.

use serde::Deserialize;

use crate::engine::protocol::{decode, layer_id, RequestRegistration, Response};
use crate::layer::LayerId;

pub fn registrations() -> Vec<RequestRegistration> {
    vec![
        RequestRegistration {
            kind: "fill_background",
            handle: |engine, payload, _b| {
                engine.fill_background(layer_id(payload)?);
                Ok(Response::empty())
            },
        },
        RequestRegistration {
            kind: "fill_background_color",
            handle: |engine, payload, _b| {
                #[derive(Deserialize)]
                struct Req {
                    id: u64,
                    rgba: [u8; 4],
                }
                let r: Req = decode(payload)?;
                engine.fill_background_color(LayerId::from_ffi(r.id), r.rgba);
                Ok(Response::empty())
            },
        },
    ]
}